I have a 98 S90 and the temperature of the AC is not cold. The blower and compressor are working, the line that carries the freon is very cold. The blue light around the AC button is not working. The blower works like it is supposed to work. Any ideas what to look at next? All fuses and relays are good. Could one of the interior ECC sensor's be bad. The sensor in the dash was replaced back in February.